Fortunately no paresthesia is reported postop.  Why is the Inferior Alveolar Canal not violated?  Fig.7 is a coronal section of CBCT taken for a 40-year-old man at the lower 1st molar (at the septum).  At the region, the Canal (brown circle) is close to the lingual plate (L).  Because of severe bone loss of the lingual plate of this case (Fig.8 *), osteotomy is intentionally created buccal (green).  The deep osteotomy may not contact the Canal, while the hemorrhage may stem from the medullary space (M in Fig.4,7).

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Xin Wei, DDS, PhD, MS 1st edition 06/26/2017, last revision 07/21/2018